http://blogs.technet.com/exchangept/archive/tags/KB967831/default.aspxTags: KB967831en-USCommunityServer 2.1 SP1 (Build: 61025.2)http://blogs.technet.com/exchangept/archive/2009/05/21/ocs-front-end-service-fails-to-start-after-kb967831.aspxThu, 21 May 2009 12:51:00 GMTd5e57398-b9ef-4490-9955-07cbb4e4a80d:3244074David Figueiredo1http://blogs.technet.com/exchangept/comments/3244074.aspxhttp://blogs.technet.com/exchangept/commentrss.aspx?PostID=3244074<P>KB967831 patch will try to update OCS and afterwards will try to start RtcQmsAgent (aka Monitoring Agent)</P> <P>If you dont use or configure this service it will never start, causing the rollback of the patch and with it the failure of the frontend service.</P> <P>So just install MS messaging queue services (ServerManagerCmd -i MSMQ-Services)&nbsp; and MS messaging queue server (ServerManagerCmd -i MSMQ-Server) and reapply the patch that will apply with success since now he is able to start Monitoring Agent Service.</P><img src="http://blogs.technet.com/aggbug.aspx?PostID=3244074" width="1" height="1">OCSKB967831